Effects of system lag on head-tracked cursor control
Steven P. Rogers, V. Alan Spiker, Susan C. Fischer · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1997
An experiment was conducted to assess the effects of system lag on head tracking performance when positioning a cursor on a stable target. Seven values of lag were tested: 0, 20, 40, 60, 80, 100, and 120 msec. To assess potential interactions, the effects of lag were examined in combination with movement distance and direction. The task was to move a head-tracked cursor to a target that appeared on a six-inch CRT screen in an analog of time and that lag was linearly related to acquisition time, accounting for an increase in target acquisition time of approximately 7 millisecond of lag. Furthermore, the effects of lag on performance were evident with lags as brief as 20 msec.